Automatically actuated brush for grainer piees



Dec. 4, 1928.

T. C. COLBIORNSEN AUTOMATICALLY ACTUATED BRUSH FOR GRAINER PIPES 6 Sheets-Sheet l IN VEN TOR.

TZllior'flsen i a v a I I A TTORNE Y.

Dec. 4, 1928. 1,693,689

T. c. COLBIORNSEN AUTOMATICALLY ACTUATED BRUSH FOR GRAINER PIPES Filed Sept. '7, 1937 e ets-Sheet 2 m vi v INVENTOR.

77 lblbiornsen A TTORNE Y.

Dec. 4, 1928.

T. C. COLBIORNSEN AUTOMATICALLY ACTUATED BRUSH FOR GRAINER PIPES Filed Sept. 7,1927 6 Sheets-Sheet 3 INVENTOR.

i err: 921:

ATTORNEY.

Dec. 4, 1928.

1,693,689 T. C. COLBIORNSEN AUTOMATICALLY ACTUATED BRUSH FOR GRAINER PIPES Filed Sept. 7, 1927 6 Sheets-Sheet 4 INVENTOR.

ATTORNEY.

Dec. 4, 1928. 1,693,689

T. c. COLBIORNSEN AUTOMATICALLY ACTUATED BRUSH FOR GRAINER PIPES Filed Sept. 7, 1927 6 Sheets-Sheet 5 y INVENTOR.

7 I lolbiorn sen A TTORNE Y.

Dec. 4, 1928.

T. C. COLBIORNSEN AUTOMATICALLY ACTUATED BRUSH FOR GRAINER PIPES Filed Sept- 7, 1927 6 Sheets-Sheet 6 INVENTOR zornsen I I ATTORNEY.

' EMA notches 18 extending upward from the lower edge of its vertical web. I

Disposed within the column is a bolt or latch 19 which slides vertically within the column and carries a stem 20. This stem extent downed-1rd through the column 16 and is urged upward by means of a compression spring 21 ln'aring against a shoulder 22 on the stem 20 and at its lower end bearing against any suit-z-ible abutment 23. Thus this latch it) or bolt is urged upward and into en gageineut with the lower edge'of the rack bar 17 or into engagement with the notches therein. The bolt 19 is l'orinedfon its edge face with an inwardly cxtendingslot 24 whose purpose will be later stated.

Referring now to Figures 1, 3 and 5, it will be noted that there is provided outward of the end 'wall and abovejthe level of the end wall of the grainer a transversely extending driving shaftjh, which at the middle ofthe .grainer is formed with a crank'26. -This driving shaft carries upon it the six-inch beveled gear wheel 27. The crank 26, as shown in Figure 1, is connected by a connecting rod, 28 to the rack bar 17 and thus this rack bar is constantly reciprocated. The rack bar issupported, as shown in Figure Z, in guides operativel y mounted uponv the transverse beams Gh As shown in FigureZ, this mounting comprises; a saddle 29.1iaving an outwardly projecting lug 30, this saddle 29 having formed therewith the angular members 31 (see Figure which support the hangers F by meansof the supporting bolts 32. The saddle 29 has a portion extending downward, as shown in Figure 3, which portion carries atits upper end the, lug .30. .Bolted t0. the lowerendo'li the depending portion of the saddle '29 is'flan angular hanger 33 and thishanger, as sl pwn in Figure 7, has boltedto .it the lower plates' gtwhich are 'rece ssed so as to. e. tend --beneath and form a guide for the .raclg har 'lh thefrack ban 17; is. uided in these ha :gei 'inembcrs 34 landhas free reciprocating movement therein,

there being a s manyof thesehangers asthere are transilerse beams G. Qffcoursg lt wlll be understqodthat in igure {l the figure is .e ut across so. asto. shorten itand only .two

s a n-e shown but that any number of tjcansverse beams may be provided, depending ,upon -the length the. grainer,

; Mounted in. bearings at right angles to the .shaft 25. 135 a. longitudinally 7 extending shaft 35 whifilh is disposedto one side of the rack an slightly lower than the raclg'shown in Figure I. This shtlftis preferably tubular and isimo ted in: hearing brackets .36 forming part of the hangers 33; Thisshaft carries mounted looselyiup'on it the. combined gear wheel'il? and clutch member 38, which will he hereafter termed the gearwheel cl uteh memher, @As; before remarked, this clutch 'member is loose upon the shaft and is held in position with the gear wheel 37 engaging the gear wheel 27 by means of the collar 39 which is pinned upon the shaft.

It will be seen from Figure 5 that the gear 37 is: twice as large as the gear wheel 27, the gear wheelfl'? in actual practice being six inches in diun'ieter, while the gear wheel 37 will be twelve inches in dian'icter. Slidingl mounted upon the shaft 35 but rotating wit 1 this shaft is a clutch member 40. This is mounted upon the shaft 35 by means of the i.ra1u-. v -=r:-:e pin 4.1 extending through a slot 42 inthe shalt (see Figure 5) and is urged toward t clutch member 38 by means of the 0; ii in spring 413, which atone end bears l bears againstthe clutch member 4:0,

member. A shipper ring 45 engages this clutch member 40 so as to shitEt'it into or out of engagement with clutch member 38. When in engagement with the clutch member 38, it is obvious that the shaft 35 will be ro tated by the shaft 25 and that when the clutch members are shifted outward or apart, the shaft 35 will be idle. The clutch member lO is shifted into or out of engagement with the clutch member 38 automaticallyfas will be later described. 7

As shown in Figure 6, the shaft is mounted n bearing brackets 46oz" other suitable bean ngs carried upon the wall of the'gra-iner and the shaft is held from an reciprocation by the collars 47, one of which constitutes the abutment against which the sprin 43 bears. The ring 45 hasthe'rods 48 exten ing longituclinally from it above and below the shaft. It is to be noted from Figure 6 that-the clutch members 38 and 40 are rovided with four v teeth disposed in qua-rtering relation so that H the clutch membersmay make-a quarter turn ecting outwardfrom a collar 5lsurrounding or mounted upon a short shaft 52 carried upon a bracket 53 projecting from the up per end of the column 23 (see Figure 7). This collar 57 carries upon it the inwardly projecting arm 58 which extends through an opening 59 in the column and engages the lower wall of the slot 24. This slot '24, as shown in Figure 7, extends inward, the-n downward. then upward as regards its lower wall, and then outward so that the lower wall is tapering and the arm 58 rests upon the upper end of this tapered portion constituting the lower wall of the slot 24. When the cam 49, moving in a. clockwise direction. strikes the arm 50, it will depress the arm'58. which will depress the latch, thus disconnecting the carriage from the reciprocating rack bar, and when the cam has passed the arm '50 the against a fixed abutment 44 and at the other or which will be hereafter termed the cam clutch cam or {in 49 which engages a tappet 50 prostandards 73 on that side.

spring {21 will force the lock back into its engagement with the rack bar. At the point where the bracket 36 extends downward, it is necessary to provide an outwardlybowed link '60 to extend around the cam shaft 35, but otherwise than this the links of the hangers F are of any ordinary or suitable type.

The rods 48 which are connected to the clutch member 40 engage a ')ivo-tcd lever or yoke, shown in. Figure 14. his yoke is designated 61 and is provided with two spaced arms 62 bifurcated for the reception of the rods 48. The yoke is pivoted upon a pivot in 63 to a bracket 64 extending from the wall D of the grainer and this yoke is provided with the outwardly projecting tongue 65, through which the pivot pin 63 passes, having a tooth 66. This tooth is adapted to engage in or against a flange 67 of the fianged-- column 15 (see Figure 12) when the carriage moves rearward to what may be termed its initial position. At the opposite end of the path of travel of the carriage, there is mounted upon the beam G (see Figure 3) the shipper lever 68 illustrated in Figure 13. This lever is mounted upon a bracket 69 and is formed with a lug 70 through which a connecting rod 71 passes, which connecting rod engages with the upper arm of the yoke or lever 61 and is formed with the laterally projecting arm 7 2 which projects into the path of movement of the column 15. It follows, therefore, that when the column, which is part of the carriage. has moved to the left in Figure 3 to the end of the grainer remote from the driving shaft 25 that the carriage will strike this shipper lever 68 and through the connecting rod 71 and the rods 48 will shift the clutch member 40 out of engagement with the clutch member 38. The same result will happen when the carriage is returned to its initial position by the column striking the toothed extremity of the lever 61, thus pulling upon the rods 48 to withdraw clutch member 40 from engagement with the clutch member 38. The specific operation of this mechanism will be presently described.

The brushes are shown in Figures 7 and 8. Mounted upon the pair of angle irons 11 are the upwardly extending standards 78, each of these standards being formed with an inwardly projecting lug 74. Two oppositely disposed pairs of brushes are used, these brushes being mounted upon arcuate bags 75 and having wire or other bristles 76 extending inward and in contact with the steam pipes B. These bags 75 are mounted upon the upwardly extending shanks 77 which carry the downwardly opening hooks 7 8. These engage over the transverse bolts 7 9 which extend between the lugs 74 of the The shanks 7 7 extend upward beyond these hooks 78 and are bolted by bolts 80 to the longitudinally extendingconnectmg webs 81 which connect the 11 per ends of the standards 73 'on that side. T 10 hooks 78 make it easy, upon the removal of the bolts 80, to lift up Upon the brushes and displace them from their engagement with the pipe B.

The vertical limb or web of the rack 16 is provided with notches 82 previously referred to, these notches having a length of approximately four inches and the distance from the center of one notch to the next adjacent notch being 2' 6". The throw of the crank 26 will be three feet. and the reciprocations transmitted to the rack bar will be three feet. The coupling clutches, as previously described, are laid out radially and in quadrants, that isfour ill all. Therefore, if the cam shaft clutch member 40 is on clutched momentarily, the cam shaft 85 will remain stationary until the gear clutch 38 has made a one-quarter revolution. Then the clutches will again be in contact, or in other Words the crank shaft will make onehalf revolution and the rack bar 17 one re ciprocation from the time the cam-shaft clutch member 40 is momentarily actedupon and the cam 49 is stopped until it starts up again. The function of the cam- 49'is to stop the car momentarily by comihgin operative engagement with the locking bolt 9 and pulling the I rack bar. As the rack bar 17 is ln constant reciprocation, the notch on the same in which the lock was engaged will have passed out of line with the lock and the car will, therefore, remain stationary until another notch either to right or to left on the moving rack 17 gets in line with the; lock. 1 I v The relative motion of the parts is as follows: One revolution of the crank shaft 25 equals two strokes of the rack bar 17, one revolution of the crank shaft 25 equals onehalf revolution of the cam shaft 35 and, therefore, two strokes of the rack 17 equals onehalf revolution of the cam shaft or one stroke of the rack will equal one-quarter revolution of the cam shaft. These relative ratios are necessary to be remembered when considering the operation of the mechanism. Assuming that. the brushing car and the rack bar 17 are locked together at the end of one reciprocation or stroke, for instance to the right of the observer in Figure 3, then the car will make three reciprocations with the rack bar and at the end of the fourth re ciprocation will be in a position beneath the first beam on the right in Figure 3.

The pinion 27 on the crank shaft is keyed in such position that when the clutches are engaged and three strokes have been made, then on the fourth stroke the cam 49 starts immediately to operate on the'lock lever 50 to shift the lock downward clear of the notch 82 in the rack bar. As the angular motion of the cam 49 is one-half that of the crank for a given time, the rack bar 17 will bolt out of the notch on the have started on its stroke to the left before the lock is liberated from the cam 49. In consequence of this, the car supporting the brushes remains stationary. When the next notch in the rack bar moving to the left, therefore, comes in line with the lock of the stationary ear, the lock drops into the notch and the car will go with the rack bar to the end of the stroke toward the left. The crank shaft has now made a one-half revolution, the rack bar 17 one stroke from right to left, and the cam a one-quarter revolution. At the end of the following stroke, which is to the right, the cam has made another one-quarter revolution and at the end of the next stroke to the left the'cam has moved another quarter of a revolution and at the end of the fourth stroke or to the right another quarter of a revolution, or in all the cam has made one revolution.

' The relative positions of the parts are now identical to the position originally stated, namely the rack bar is at the end of the oscillation to the right and the cam is again ready to act on the lock lever. The car will, therefore, engage the next notch to the right as rack bar makes a stroke to the left. The car is therefore; advanced two notches to the left or approximately five feet. As the motionof the car is slower at each end of the operation and nothing at. all at one moment and most rapid at the middle of the operation, the distance between the centers of the notches is 2 6 or half the length of the stroke. Therefore, all parts of the piping will receive an equal service in regard to the speed of the brushes; At the end of the last stroke or reciprocation at each end of the grainer the. car bracket or column 15 will come in contact with the lever 68 or lever 61 and draw the cam clutch out of engagement with the gear clutching member. The

car acts on each clutch lever twice, after which the .travelofthe car or carriage is reversed. Should it be desired to stop the carriage atany time, the yoke end of the connecting rod 71 may be lifted from its engagement'with itheyoke 61 and suspended temporarily. In. case of reversal ofthe travel, a momentary pull on the handlever (not shown) which may be connected to the shipper ring 45 will change the relative position of the cam and rackbar and, therefore, reverse the car travel.

Attention is particularly called. to the pipe hanger shown in Figure 7, inasmuch, as these pipe hangers permit of continuous and unobstructed treatmentby brushing every part of the pipe. Ordinarily for the suspension of grainer pipes as well as for piping in gun era], the ordinary round iron staple hanger is used having two vertical members, one on each side of the pipe and forming the semicircular saddle under the same, the members being anchored to cross beams above the grainer. An attempt in make a pair of sen'ii-cireular brushes pass an ()bh'tl'llfltlOll prc:-;ented by a four-inch staple or straddle hanger would result in immediate obstruction and breaking up of the wire in the brushes unless the brushes were automatically forced to open or spread apart in pass ng the hangers, in which case nearly 157,} of the piping would be excluded from contact with the brushes and the brush ng arrangement would. therefore, fall far short of its necessary function.

As; shown in Figure 7, the pipe hanger coir sists. of the band F which .is by 3" wide and to this band is riveted a circular band of the same dimensions which embraces the pipe. This is welded or riveted to the vertical portion F. This in turn rsiupported from the beams G in the manner shown in the draw ings. The brush hangers 77 are made of spring band steel so that they are flexible and permits the brushes to yield as they pass these hangers, or rather as the bristles pass the pipe-embracing portion of the hangers.

I claim:

1. The combination with a pipe, of a cleaning means mounted upon the pipe and operating thereon, means for causing the cleaning means to reciprocate longitudinally of the pipe, the length of the reciprocation being relatively short and means to intermittently advance the cleaning means step by step along the pipe with respect to said reciprocating means for the full length of the pipe.

2. The combination with a plurality of pipes, of brushes mounted upon each pipe and operating thereon, power operated means for causing the brushes to reciprocate longitudinally of the pipe, the length of stroke of the brushes being relatively short, and means for intermittently advancing the brushes step by step along the pipes for the full length thereof.

3. The combination with a plurality of pipes, of brushes mounted upon each pipe and operating thereon, power operated means for causing the brushes to reciprocate longitudinally of the pipes, the length or stroke of the HUSllSS being relatively short, and means for intermittently advancing the brushes step by step along the pipes forthe full length thereof and automatically reversing the movement of the brushes at each end of their journey along the pipe.

4. The combination with a pipe, of a cleaning device mounted upon the pipe and operating thereon, means for shifting the cleaning means longitudinally along the pipe from end to end thereof and-giving the. cleaning means reciprocations having an amplitude relatively short with relation to the pipe andincluding a constantly operated reciprocating member, i'ncans for operatively connecting the cleaning means to said reciprocating member for movement therewith and intermittently re" leasing the connection between the cleaning means and the reciprocating member whereby to permit the, reciprocating member to move forward or backward with relation to the cleaning means during this period of disconnection to thus cause a step by step advance of the cleaning member along the pipe.

5. The combination with pipes extending parallel to each other, of brushes mounted upon the several pipes for engagement therewith, a carriage operatively supported for movement parallel to the pipes for the full length thereof, and power operated means for causing the carriage to travel from one end of the pipes to the other and back again and simultaneously restricting the brushes through strokes of amplitude relatively small with relation to the length of the pipes.

6. The combination with parallel pipes, of brushes mounted upon the several pipes for engagement therewith, means for giving a reciprocation to the brushes of relatively short amplitude compared with the length of the pipes, and intermittently advancing the brushes step by step along the pipes to thereby cause the brushes to operate over the entire length of the pipes.

"71 The combination with parallel pipes, and hangers supporting said pipes, of brushes disposed upon and operating on the several pipes, a carriage mounted for movement longitudinally of the pipes, means for causing the carriage to travel longitudinally of the pipes for approximately the full length of the pipes, and means for causing reciprocation of the brushes relative to the carriage, the reciproeations having amplitudes less than the length of the pipes.

8'. The combination with parallel pipes and hangers supporting the pipes, of brushes disposed upon and operating on the several pipes, a carriage movable longitudinally of the pipes, means for supporting thebrushes, and power operated means for moving the carriage longitudinally of the pipes from one end to the other of the pipes and simultaneously giving the carriage reciprocations of short amplitude relative to the length of the pipes.

9. The combination with a pipe, of a brush mounted upon the pipe for movement therealong, power operated means for moving the brush along the pipe including a rack bar extending longitudinally of the pipe, power operated means for constantly reciprocating the rack bar, means for interlocking the brush with the bar for reciprocation therewithduring a plurality of strokes of the bar and intermittently disconnecting the brush from its engagement with the bar to permit the bar to move forward or backward with relation to the brushes to thus cause a step by step advance of the brush along the pipe.

10. The combination with parallel pipes, of brushes disposed to surround the. severa pipes, a carriage movable longitudinally of the pipes, overhead transverse beams supporting the pipes, a longitudinally reciprocatable rack bar slidingly mounted upon said beams and extending longitudinally of the pipes, power operated means for constantly reciprocating said rock bar, an element mounted upon said carriage and moving therewith and having a slot through which the rack bar passes, a bolt disposed in the element and yieldingly urged against the rack bar and into the notches thereof, a longitudinally extending shaft, and means mounted upon and rotating with said shaft for inter mittently engaging said bolt to retract it from the rack bar whereby to permit the rack bar to reciprocate through a stroke Without reciprocating the carriage whereby to cause the travel of the carriage step by step from' one end of the pipes to the other.

11. The combination, with parallel pipes,

of brushes disposedto surround the several.

pipes, a carriage extending below the pipes and movable longitudinally thereof, transversebeams supporting the steam pipes, a longitudinally reciprocatable rack bar slidingly mounted upon said beams and extending lon-.

gitudinally of the pipes, ;power operated. means for constantly reciprocatingsaid rack bar, an element mounted upon said carriage and moving therewith and having a slot through which the rack bar, passes, a bolt disposed in the element and yieldingly urged against the rack bar an into the notches thereof, a longitudinally extendingshaft, means mounted upon and rotatingwithsaid shaft for intermittently engaging ,saidbolt to retract it from the rack bar whe eby to permit the rack bar to reciprocate through a stroke without reciprocating the carriag'e wherebyto cause the travel of the carriage step by step from one end of the pipes tothe other, and means forlstopping said rotating shaft momentarily at each end of the path of travel of the carriage to tliereby calise a iovementof the carriage in a reversedirection to its previous direction of travel.

l2. The combination with parallel pipes, of means forcleaning the pipes comprising brushes mounted upon the several pipes, a carriage movable parallel tothe pipes and supporting the several brushes, means for causing a movement of the carriage rom one end of the pipes to the other andback again and simu taneoiisly ,reciprocatini the carriage in strokes. of relatively 'smalfamplitude comprising, a power operated shaft having a crank, a bar operativel conneeted to the crank to be reciprocate tl erebyllngi tudi nally of the pipes and having notches in its face, a member mountedupon the carriage and extendingupward tolsaid bar and hav ing a slot in which. the'bar is disposed, abo t mounted upon said member, a spring urging l the bolt into engagemept the bar, the

longitudinal shaft at a less speed than the crank shaft, and means for momentarily disconnecting the longitudinal shaft from the crank shaft at each end of the travel of said carriage, said means being automatically actuated by the arrival. of the carriage at the end of its travel.

13. The combination with parallel pipes, of means for cleaning the pipes comprising brushes mounted upon the several pipes, a carriage movable parallel to the pipes and supporting the several brushes, means for causing a movement of the carriage from one end of the pipes to the other and back again and simultaneously reciprocating the carriage in strokes of relatively small amplitude comprising a power operated shaft having a crank, a bar operatively connected to the crank to be reciprocated thereby longitudinally of the 'ipes and having notches in its face, a mem er mounted upon the carriage and extending upward to said bar and having a slot in which the bar is disposed, a bolt mounted upon said member, a spring urging the bolt into engagement with the bar and the notches whereby the member and the carriage shall travel with said reciprocating bar, means for intermittently withdrawing the bolt from its engagement with the rack bar comprising a longitudinally extending shaft, means for driving the longitudinally extending shaft from the crank shaft including coacting clutch members yieldingly urged into engagement with each other, a trip cam mounted uponvthe shaft and adapted to operatively engage the bolt to momentarily retract it once upon each rotation of the shaft, means for causing a rotation of the longitudinal shaft at a less speed than the crank shaft, means for momentarily disconnecting the longitudinal shaft from the crank shaft at each end of the travel of said carriage, said means being automatically actuated by the arrival of the carriage at the. end of its travel, said means including levers operatively supported at the opposite ends of the travel of said carriage, and connecting means between said levers and the clutch members acting tocause disconnection between the clutch members when said lovers are struck by the carriage.

i 14. The combination with a plurality of parallel steam pipes, and overhead transversely'extendingbeams having hangers supporting the steam pipes, of means for cleaning the pipes comprising a longitudinally extending T-shaped rack bar mounted in guides operativcly supported upon said beams, the depending web of the bar being provided with notches at intervals, a poWer driven crank shaft having a crank operatively connected to the bar to constantly reciprocate the bar, a carriage extending beneath the series of pipes and upward and operatively supported for movement longitudinally of the pipes at each end, a plurality of pipe brushes mounted upon said carriage, each for engagement with a. pipe, a column extending upward from the carriage and having a slot receiving thedepending web of the bar, a bolt mounted within the column and resiliently urged into engagement with the web of the bar, a longitudinally extending shaft having a longitudinally extending cam trip mounted thereon and extending radially therefrom, a lever mounted upon the column and having one end engageable by said trip as the shaft rotates and the other end engaging with the bolt, a movement of the cam trip against said lever causing the retraction of the bolt from engagement with the bar, a gear wheel mounted upon the crank shaft, a gear wheel loosely mounted upon the longi'- tudinal shaft andhaving a clutch member, a clutch member slidingly mounted upon the shaft but rotating therewith and coacting with the first named clutch member and resiliently urged toward the latter, and means for retracting the second named clutch member from the first named clutch member when the carriage reaches either end of its travel at the opposite ends of the pipes, the cam shaft having a rotation approximately onehalf the speed of rotation of the crank shaft and each clutch face having clutch teeth disposed in quartering relation.

15. The combination with parallel steam pipes, and overhead transversely extending beams having hangers supporting the steam pipes, of means for cleaning the pipes comprising a longitudinally extending T-shaped rack bar mounted'in guides operatively sup-- ported upon said beams, the depending web of the bar being provided with notches at intervals, a power driven crank shaft having a crank operatively connected to the bar to constantly reciprocate the bar, a carriage extending beneath the series of pipes, a plurality of pipe brushes mou nted upon said carriage, each for engagement with a pipe, a column extending upward from'the carriage and having a slot receiving the depending web of the bar, a bolt mounted within the column and resiliently urged into engagement with the web of the bar, a longitudinally extending shaft having a longitudinally extending cam trip mounted thereon and extending radially therefrom, a lever mounted upon the column and havin 'one end engageable by said trip as the shaft rotates and the other endengaging with the bolt, a movement of the cam trip against said lover causing the retraction of the bolt from engagement with the bar, a gear wheel mounted upon the crank shaft, a gear wheel loosely mounted upon the longitudinal shaft and having a clutch member, a clutch member slidingly mounted upon the shaft but rotating therewith and coacting with the first named clutch member and resiliently urged toward the latter, and means for retracting the second named clutch member from the first named clutch member when the carriage reaches either end of its travel at the opposite ends of the pipes, the cam shatt having a rotation approximately one-halt the speed of rotation of the crank shaft and each clutch face having clutch teeth disposed in qnartering relation, said retracting means including levers supported in the path of travel of said column, and a connecting rod ongag ing said levers and operatively connected to the slidable clutch member.

16. In a pipe cleaning apparatus of the character described, the combination with a pipe and a member traveling beneath the pi 3e, of columns extending upward from said member, there being a pair of columns on each side of the pipe, each pair of columns being joined by a bolt, SGlhl-CllCUltlX brush backs having radially projecting bristles ei'igag'ing the pipe and having vertically extending shanks, each shank having a hook engaging said bolt, and bolts engaging the upper end of each shank with the corresponding pairs of columns.

17. In an apparatus of the character described, a plurality of parallel pipes, a transversel y extendin g carriage extending beneath the pipes and extending upward at their ourcr ends and having supporting wheels, a plurality or sets of brushes mounted upon the carriage and each including approximately arcuate backs having bristles extending inward an d toward the corresponding pipe, and power operated means for reciprocating the carriage and simultaneously causing the carriage to travel from one end of the pipes to the other and back again.

18. In an apparatus of the character described, a pipe, supports disposed above the pipe, hangers for the pipe, each' hanger en gaged with said supports and each hanger including a relatively thin, depending, metallic member, a relatively thin pipe-embracing portion attached to said member and embracing the grainer pipe, brushes disposed upon each side of the pipe and each including a semi-circular member having inwardly projecting bristles contacting with the pipe, vertical, resilient, supporting members to which the semi-circular members are attached, supports for said resilient members, and means for shifting said last named supports longitudinally of the pipe to thereby clean the pipe.

In testimony whereof I hereunto afiix my signature.

THORVALD C. COLBIORNSEN. 

